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【单选题】
下列溶液中，凝固点最高的是( )A.
0.02mol·L -1 KCl
B.
0.10mol·L -1 K 2 SO 4
C.
0.02mol·L -1 BaCl 2
D.
0.02mol·L -1 HAc
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举一反三
【单选题】Birds, _______ or familiar, were popular in Rome.
A.
historic
B.
exotic
C.
alcoholic
D.
erotic
【单选题】Mass deaths of birds were not unheard of, but they normally happened unnoticed at sea or in rural areas away from towns. Many birds are weak and die in winter _______ food is scarce.
A.
which
B.
what
C.
when
D.
how
【单选题】It can be inferred from the passage that the Archaeopteryx were classified as birds on the basis of
A.
imprints of bones
B.
imprints of feathers
C.
the neck structure
D.
skeletons
【单选题】The birds were very friendly to Bill Pochmerski, one of the volunteer observers, because he wore a neutral mask.
A.
Y
B.
N
C.
NG
【单选题】We rented the old house on the ______ that the landlord would paint it, but we were disappointed later.
A.
reassurance
B.
assurance
C.
assumption
D.
acknowledgement
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